Friday 31 July 2020

CBSE Class 7 - Science - Physical & Chemical Changes (Worksheet)(#eduvictors)(#cbse2020)(#class7Science)

Physical & Chemical Changes (Worksheet)

CBSE Class 7 - Science   
CBSE Class 7 - Science - Physical & Chemical Changes (Worksheet)(#eduvictors)(#cbse2020)(#class7Science)

Fill in the blanks with suitable words:

1. In a ________ change, no new substance is formed.

2. Shape, size, colour and state are called __________ properties of a substance.

3. Rusting of iron occurs when iron gets in contact with moisture is an example of _______ change.

4. Change in the colour of the substance often indicates that it is a ________ change.

5. Litmus paper shows blue colour, it indicates that the medium is _________.

6. Take vinegar (acetic acid) in a glass beaker and add a pinch of baking soda (sodium hydrogen carbonate) to it. We observe gas bubbles coming out of the beaker. This is due to the release of ____________ gas.

7. The rusting of iron can be prevented by coating iron with zinc, this process is called __________.

8. Melting of candle wax is a______________ change but its burning is a ______________ change.

9. Chemical name of Blue Vitriol is ____________.

10. Crystallisation is an example of ___________ change.

11. Photosynthesis is an example of ___________ change.

12. Stainless steel is made by mixing _____ with carbon and metals like chromium, nickel and manganese. 

1: physical
2: physical
3: chemical
4: chemical
5: basic
6: carbon dioxide (CO₂)
7: galvanisation
8: physical, chemical
9: Copper Sulphate
10: physical
11: chemical
12: iron

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